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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712d74be561ab958a1345c580fd13418e6f978d78f20e97483f652e9a8e21d83' 
  AND token = 'NCsJgPEn0MQcajkQJf+3u0CxJyQUCkJExm2Pzyc2HTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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