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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1a5e75acfc40fce9d2c0921904a17c1bdce2de75256fb62b8d8ce0e213707c' 
  AND token = 'lN1ecNT3doSa94P6x49FA0W1rpo6324lGdjb8rdzlZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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