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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e231f45970d5c4f289ff9415140d6c47bd67fd22e070979140aeaef20d80e0' 
  AND token = 'trdWmX+10nLU0DvvbXuKje0B/fFIsafiBwX6KUjctgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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