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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8320aed1a911d2f78c67a075434e06d5a0b74a066b1611cd7cb00f33ea7f860' 
  AND token = 'IrdSe5JHd0G1gEOuQkDYLrMwvfpEAiWc1FKl71yydHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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