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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5ad30146e1a7ae43bb20ac68b8493b938b2db6d1f26c60ead18480739d9d0d' 
  AND token = '9fx4YQX64oXJ8aZhBhosOXajskA5yx+1zKP3qf0sYIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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