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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f704a84300b0b8a0f98f99e7ef46b90bbc01fe9d938e3fa841e1a2138864a3' 
  AND token = 'NXON/+4qdzZflxTDEgL9ajsPEYVQFcthyR3N1NJJzsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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