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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d937caac4a1fb4d457c5c8bdbb065d12848a4f1107b263e34da16aa7c9dc9f3' 
  AND token = 'BrW/g9/rIhvDEUbpyVIFPcclajkMJYnph/DT5FiTvIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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