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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c038fcf317ef190308bd62e2574a5986679fbd77c3127bffca5f6b6e7588a0e' 
  AND token = 'Rbr5pFOdYCb0OIjEDWPFYMP4K1cNXcF32nBCF7lGVyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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