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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dedb5e03cca90bf7a769fc027b16cd2a61f4e12e130b03375878a85b4713c7' 
  AND token = 'pubpFxEFwz5C0NwK7rfJ2Dq00u7kNM7zmLds8ngL9Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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