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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e8e602dcf4aab1f7408afb515897516b6652447e99f29507135bb4c1089d62' 
  AND token = 'HAozPmS4WMTuic7gTau6TEcroPnNUbJJ8vUS7nFsGuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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