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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70679df5efdc2287705f0e45d5775f0face20a450c846ac8261959459e5f9878' 
  AND token = 'ipNP2/9UaiLHtaJ1bD423rQuRC0C/Pn69iNEmujOBEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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