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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa19c395f16df63cd6e6abee52307b4ee060e1856896115ac9701d2a80fd9aa' 
  AND token = 'FVeKvL0NaDo4zBDZItxdaKlF5aOtsN2zeoshHJTXos0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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