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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b061fe30273d2621a0ae79240c66ddb7d76c428e97b8be196d2adc077fc0fe7b' 
  AND token = 'scr/dONQCiccNR5BhaZePaRKBu9BFTqd/vrarXGdtTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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