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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30533d42ca40cbea09daddee7c95da1ab55045f81539990e81f73be60118d2ac' 
  AND token = '+s5UsC+PasnYR5Hz9lf62kQfRUc2WziV0d1umXJNDcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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