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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8f2202c7a223c2c87ae2b41ce43bd76eefb0f8a9825689663179de35ef930b' 
  AND token = '9mPQb7OjaznaI1Z6fgcgLynJyFrRjRn8mHHI30oK29o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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