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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c1c871fbf3990293ea521f5dbfe5ad2d161606d7e5606fd892d2c86bcfdcf1' 
  AND token = 'AKikGrz6NhZwcmDuSnhEqsDOXU7dfuq2oiuMxGlA95E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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