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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfa0ef1bafc38d5e50f8f7fbacbb9d9aec6eb6d2aef8495ada568f80f497d06' 
  AND token = 'r2ZxlX3t6zBYYAhm7GbwEdB/l+Bnv3MmQeH6K6DH3xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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