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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043f1fb0dbee869ef3c876e172d13838de439011a1ff030dedfb7802161d7f0b' 
  AND token = 'ZbXJ+uNKAllMbuC1d3Pe84N4LHgNNaa0xFvZUhuY710=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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