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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a91da473cf10fb49a29f744fbe5c43e40dac1f92e7ce1add67095dee001c4d' 
  AND token = '8pT6uH6B5RFNmoeR6fXbju+mPHwszVGYoZciNRe54vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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