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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dbd78b873fcaf15f120f8a5392be548343b385a2c58340cb76c3e15ae5989c3' 
  AND token = 'y9eIon5cyoldRhW26FJ4PU3km85Ca7deiw6iZcQs29o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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