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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f4e34653814935c48399d4b14f8d6ffcc07604aa84c7dab696227dc8b99037' 
  AND token = 'GKtNaTklkNr+YgHhUdhGzcThu6pScDPoaJB8viHo/Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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