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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6955f6ee2241a613caef5df6c121ea092b692e37e172ea42f262393ee2c37dff' 
  AND token = 'OeeikcRQdG4vKt77QVWTdiwGit5Ee2MwvYkAfuGidGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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