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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f277aa89029f0a97a2798f4b6c87d8ab85b4a602617cdde4c06048c05be80073' 
  AND token = 'TY1repmG43QYTTXPu7JLX/BFTNFnFRghZLquWDKtueE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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