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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20313c449a7997da68c204e4d6ca3c8a1b6f4cef8cdce12177f9cf462b4cf53c' 
  AND token = 'DXqcLT7q0xYRZoOSfqN/W6i8lBFcReE22Wizvab/pAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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