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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d34fa64fc5ec7d6a95c02e609ecc4c885651d627132876393451ff35ca9f84' 
  AND token = 'HohK1ESFPOTTLcEhbDIhOPjXLV+a5Z7Sb5FLGy2rBIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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