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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8a4db670691a63e6e85e8de911d10aa212708569d8e248564f6b1a75c6f7e8' 
  AND token = 'bsik/QFdnj6mMNjXj2C50gTJbXmKUPvq6OI4YN90pGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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