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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb37a3756b4765a06507a5cf9d997f11549cf99f3bb74b99ffc8e13075a2bec0' 
  AND token = '0pusrjGti8fnlmoZ/PzMd0TE/YkLmOfHRD7nfPWkYqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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