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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e220f6d3c7241020ffc21ac88703825ca3efa3ebdced4bf873ceef988f32c0ad' 
  AND token = 'Vje5ST/VG/R98VioZsGp+IdWCgeGNGcafkld6QuOtos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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