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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3acd8693e518fb1d9d76cebfda2f525cf07aad01c8f446e0c3b07547d4ead0' 
  AND token = 'ExGB9pAkzvMDUWHqE0LID6d2N5b79c7skp7t9YN/uoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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