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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54aa02c1e63dd5a291a8f202049fa9660dd987d787a6194ebbd01da8caca944' 
  AND token = 'RhKakAsGOcMw1NdH1AFOk8SNZJtQP9A0HJHp2nBS3Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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