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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc1c11d854bc46560fc884e04a76b1bf4ecca9ba202fc9b5db4de3982b7b4ed' 
  AND token = '/cB+sEhdFq/t/Wr5fhFdxnyLUwN4Yted40AI8FKKovw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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