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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8103c5a00a784e2ca4e40874da4fe4751638223d0b696be9421f17ecb5b977f1' 
  AND token = 'gHPplVgXCNY7SHIp+18fbJW2HjU7D1k7lha0GNbxcQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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