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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504ae414c47430f2fdab8e83e147b4033a96537fea0d25f38c3b07db5d3e4cf6' 
  AND token = 'tX1wjrZ3By9h4OpFDAYmkcUz0qXpiIC88vXUBltj+aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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