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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7558df4296552cb20495d2430cf54499b95e12e7833e8c12f7751b58818691' 
  AND token = '/fdZ9nG9Z5bn+xgu0eLO7SqSdOmc6slL29uYYFHSNqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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