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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3c816ea6f49ea694ae7c1f830f1144f8bfb691cacdabefef295f003a202bec' 
  AND token = '/Hacg0+i2gWU5Dnf4MbuIX/IPBaD1ckQofzINBXmRXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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