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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9c89831c20b282c6012d0b3c35cff334b592429aa1f6d358160ad83ef78032' 
  AND token = 'jM5mTRqpstNb9vHC34xsJjxAKydfstzLc/7Q7PbOoMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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