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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8437386eee7a56c2fec905646face8f6e43e45eae63df4e51cdd7cf774c7cc8b' 
  AND token = 'PQAXOBzhnrLrz2a3OgjSanTQLjXgIGnzJ4Oxkx6OUbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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