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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93623318f9d49066e91d94ca29afccae5e192ed5588254dfda58131dab4eb41d' 
  AND token = 'luPqewhjAift83Z41IcjCNEOUe8WsFiHB8o67tu/Qhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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