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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1cd90c8758772251b2f77bd63a18aed13af018c728dcd503cbc6737fc56962' 
  AND token = '4V23KUyKYgvZTfE0zpMcZrhUr6NL5srLhFOSqXVllhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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