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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa636140d23cf7e268f81dd3a7d26e2ec7c71108d8ea4754259c45799fd8fb9a' 
  AND token = 'rpiN+tjt6Glp/OHyypfw6ycE263rDVQvcUAbhIEorNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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