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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084e19cce1d5604859c0a8d7fc9240e232eded75c23398bdba1e129661a506db' 
  AND token = 'dzjFAi79N5G/n3pTpweDZFp4Yj/5g4T2jYbCpCy5hzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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