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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fc612dcc949d94da7a692a338c82ee72382e68e695e6d9f9ad606910a8eaf5' 
  AND token = 'PkdHX/c2h3CAlKDiW+82HCgiP/gRYLtEfnN28OaJLsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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