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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79665c8d1b544a2b365f7cc093f25e02792dbf1231de813e3115d19fc3fd457a' 
  AND token = 'OxnWvX1G0xdAJuvblZCZgNPBxi7Qfz18ucqnkayZ6+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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