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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4e1ef9e0fd175e40c0892f04aad6e7a80efa07655228c30cbe0a7da0ef81db' 
  AND token = 'Nn/DtM1auJTlolV9CcgCQ5htGCSqfDG8ZjyNF0KB0og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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