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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38d8fba88e27937aba46e6c3d39da28fd631fe1a84f385279af207c19235e17' 
  AND token = 'qdCwR7IWAry+2aWrGpcR+McyCNpM4V3njzK4Ms3RgCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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