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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbeb9dc23b9d287fc0141cac72bfbe8ba60c7b23fefe2245d45ad49ab426b7a' 
  AND token = 'I0V6Wdbbn1SBNqWSxzWkMhrYpf0bRdIFc4vLS23IHP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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