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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89920ce3052299204c996de3f6ff1cd6828a628d60885ca7b567b466460ee07b' 
  AND token = '89YOqVBTNqlI65yR3uCB8snR/05qXkNFgC4YV8JKyUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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