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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c46ca1a58e2429a9de528cbd0b33d38a0da4ff1989d93c99441ecfeecc8832' 
  AND token = '0MBmS+5pVflHsScnN8BK5OL9eqm2gW1h3WJfF5nMkzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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