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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a58dabd042cd0393de5b106199025237a1395729ba514ca35ca58a5ee8bc73a' 
  AND token = '7FScuum/qiaCsInR2e574j8MzXctBHsLfn+w34sPlt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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