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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5cd8677c6f683bd25d348b07dd6b6ea876efd4a1786f9a90896fad20c65bc0' 
  AND token = 'Fb1NFeM+FBZE8NlDmvEtQlaI4d0oNrK680fdtPVsf0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}