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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3c6b679c57ecfc8fb409bd2e171c67bc687e6e6e147b84598fbdb6741f04ca' 
  AND token = 'm7mYbJN5PeOh/WrSCKca4cGHfoSsFG1ESHgupTui058=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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