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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5b8321224d6ce2a0256b0c0627eba1f84bf7977db196058d06dbe682b979e1' 
  AND token = 'HVY0zEws3+47ma6L4koGfM3J5dhBfoxhReThkmvaWhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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