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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4556c54350f7f94ff1da40c432c47e55f2afaa56188258bad0aff451875e78dc' 
  AND token = 'qOAr/N8qPoNBbZqJB95AaJLSq4v02HrmJ3S06+wgk9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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