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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c37442efeab25a23bc8b311c154147a6082a945653285f0e290fcbe7c5d190' 
  AND token = 'dMzQ9mRbgwOHMebwK2U2IEXSxk0at27e6SRfouI1dcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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