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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98dde4e77b833147a4fb6529e99a26924eb9793febedc66d8a86816b1afe49cd' 
  AND token = '6EQpXnrhZkT0+MhXct+IT+gKY1mIm5JefM4VCMY5vzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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