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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8310c473f478d38c511671f78e1461a691a8f4e64162fd11cf4ff850c2b51d' 
  AND token = '9+dVSgjML8DueCpwuFixdkpLUOpov0UM4I6mHG1W98Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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