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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7ac6fab254eb119db88164bfc39c5bcb3d5ee91212590279222e8f6421792a' 
  AND token = 'WF6hMli5/PmdCw+e8roKdBULgGcJKHwQ1W5VdIrRy7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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