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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11aafc8b7da1c39d76d2c1ce4b5b3f558384a81a90775fc6f578e8e42530a41' 
  AND token = '05UEQh8qw/dM/roGsjSyO1k/IG/DHgOtGoDqxmK8PIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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