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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2de8fa00bcf73da009571c6af2055c77e05f317b7a20535a67d737645a4366' 
  AND token = 'cFiX5G9xjJPKIJ1bh+Dmf39qifKO01OCvg/3vdgVq8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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