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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36226994f4d2fc7edfaaa5dfdeee38d47d2b074fcaabefb69dd21c56681c04d3' 
  AND token = 'WgCvwiWsiK4cDOEmeY1QxRjvk1MitNVpsQNUZs+ylq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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