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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdf24fa0b03cbc159fb1d7f4cd312c1f91db84c04eb7fda222b68c7bca3dc36' 
  AND token = 'QoMd/M/6jg9IxAwKY+ZX4Zlj1WnkrO9wiGM439s3K+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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